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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Poly(1,1,2,2-tetrafluoro-2-[(trifluoroethenyl)oxy]ethanesulfonyl fluoride-co-tetrafluoroethylene) lithium salt (CAS No. 1687740-67-5) (provided for in subheading 3904.69.50)........ 1/ 9902.10.81 On or before 12/31/2020 No change No change Free 1/ Poly(1,1,2,2-tetrafluoro-2-[(trifluoroethenyl)oxy]ethanesulfonyl fluoride-co-tetrafluoroethylene) ammonium salt (CAS No. 1126091-34-6) (provided for in subheading 3904.69.50)........ 1/ 9902.10.82 On or before 12/31/2020 No change No change Free 1/ 1,1,2-Trifluoroethene - 1,1-difluoroethene (1:1) (Vinylidene fluoride-trifluoroethylene copolymer) (CAS No. 28960-88-5) (provided for in subheading 3904.69.50)................................... 1/ 9902.10.83 On or before 12/31/2020 No change No change Free 1/ Poly(1,1-difluoroethene-co-1-chloro-1,2,2-trifluoroethene-co -1,1,2-trifluoroethene) (CAS No. 81197-12-8) (provided for in subheading 3904.69.50).............................................................. 1/ 9902.10.84 On or before 12/31/2020 No change No change Free 1/ Mixtures of approximately 25 percent propanoic acid, 3-hydroxy-2-(hydroxymethyl)-2, methyl polymers with 5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane and reduced methyl esters of reduced polymerized, oxidized tetrafluoroethylene, compounds with trimethylamine (CAS No. 328389-91-9), less than 1 percent 2-propanol (CAS No. 67-63-0) and less than 1 percent 2-butanone (CAS No. 78-93-3), remaining content water (provided for in subheading 3904.69.50)................................................................................... 1/ 9902.10.85 On or before 12/31/2020 No change No change Free 1/ Perfluoropolymethylisopropyl ether having a boiling point above 170 degrees Celsius (CAS No. 69991-67-9) (provided for in subheading 3904.69.50).............................................................. 1/ 9902.10.86 On or before 12/31/2020 No change No change Free 1/ Mixture of poly(1-[difluoro(trifluoromethoxy)methoxy]-1,1,2,2-tetrafluoro -2-(trifluoromethoxy)ethane) (CAS No. 69991-61-3) and Perfluoropolymethylisopropyl ether (CAS No. 69991-67-9) (provided for in subheading 3904.69.50)................................... 1/ 9902.10.87 On or before 12/31/2020 No change No change Free 1/ 1,1,2,2 Tetrafluoroethene, oxidized, polymerized (CAS No. 69991-61-3) (provided for in subheading 3904.69.50)............ 1/ 9902.10.88 On or before 12/31/2020 No change No change 2.4% 1/ Ethene, 1,1,2,2-tetrafluoro-, oxidized, polymerized, reduced, ethyl esters, reduced, N-[2-[(2-methyl-1-oxo-2-propen-1-yl) oxy] ethyl] carbamates (CAS No. 1385773-87-4) (provided for in subheading 3904.69.50) ......................................................... 1/ 9902.10.89 On or before 12/31/2020 No change No change Free 1/ 1-Propene, 1,1,2,3,3,3-Hexafluoro-, oxidzed, polymd., reduced, hydrolized reaction products with ammonia (CAS No. 370097-12-4) (provided for in subheading 3904.69.50).......... 1/ 9902.10.90 On or before 12/31/2020 No change No change Free 1/ 1/ See chapter 99 statistical note 1. Rates of Duty 1 Harmonized Tariff Schedule of the United States Revision 15 (2026) Annotated for Statistical Reporting Purposes XXII 99 - II - 84 Note:The shaded areas indicate the provision has expired